To solve the inequality:
[tex]\begin{gathered} -6x\leq-42 \\ \text{Divide both sides by -6:} \\ \frac{-6}{-6}x\leq\frac{-42}{-6} \\ x\ge7 \end{gathered}[/tex]
Now, the graph of this inequality would be a number line with a shaded region of any number greater or equal than 7, like this:
